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Compact air moving device

a moving device and air technology, applied in the direction of axial flow pumps, pump components, fluid engines with non-positive displacement, etc., can solve the problems of difficult heating or cooling this vast area, thermal gradients, and industrial hvac systems that may suffer from dead spots having little to no circulation

Active Publication Date: 2021-03-02
DLMFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The device delivers a noticeable breeze up to 60 feet away, improving comfort and reducing thermal gradients by providing a localized, high-velocity air flow, while being compact enough to fit in industrial settings without interfering with existing infrastructure.

Problems solved by technology

Heating or cooling this vast area is difficult, and results in thermal gradients from the floor to the ceiling as warm air rises and cooler air is pushed downward.
Often, an industrial HVAC system may suffer from dead spots having little to no circulation.
Ceiling fans have been utilized to alleviate some of the discomfort associated with dead spots or thermal gradients, but due to the great height at which they must be installed, they are largely ineffective because the fan air dissipates in large part before reaching the floor.
Large diameter, slow spinning fans have also been utilized, but due to their enormous size (e.g., 20 foot diameter) they are difficult to position and may interfere with existing lighting, HVAC, or sprinklers.
This may help alleviate thermal gradients, but the lack of velocity does little to provide comfort to a worker on the factory floor, who just needs to feel a breeze.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030]In one experiment, air velocity measurements were recorded with and without the de-swirl vane package 136 installed in the outer casing 102. The measurements were recorded at a distance of 17 feet from the outlet portion 106 of the air moving device 100. The air velocity without the de-swirl vane package 136 was 300 fpm (3.4 mph), and the air velocity with the de-swirl vane package 136 was 1000 fpm (11.4 mph), a threefold increase. In addition, the columnar flow had a sharp edge boundary, meaning the velocity dropped off rapidly radially outboard of the flow column, defined by the outer casing diameter.

[0031]The disclosed air moving device thus provides a compact air mover mountable to the ceiling of an industrial work area to provide a localized, high-velocity, laminar air flow for industrial workers. Even when the air moving device is mounted at a height of 32 feet, the device delivers a noticeable breeze to workers up to 60 feet away, which aides in evaporative cooling and ...

example 2

[0045]An early prototype air moving device 100 comprised four blades 128 rotating at 2000 rpm, and six downstream de-swirl vanes 138.

[0046]The vane passing excitation fundamental frequency may be expressed as:

Fpass=(NV×Ω) / 60=(6×2000) / 60=200 Hz  (1)

[0047]The higher harmonics or multiples of the fundamental frequency may be expressed as:

Fharm=m×(NV×Ω) / 60=m×200 Hz=400 Hz,600 Hz,etc.  (2)

[0048]To calculate the subharmonic fundamental frequency, the common factor must be determined:

Number of blades(NB)=4=×2;

Number of vanes(NV)=6=×3;

Common Factor(NCF)=.

[0049]Then, applying Eq. (3) above for a vane excitation on a rotating blade:

Fsubh=(6×2000) / (2×60)=100 Hz  (3)

[0050]Since the hub 130 is spinning at 2000 rev / min or 33.3 rev / sec, the 100 Hz excitation frequency is a third modal of the speed (m=100 / 33.3=3) and therefore poses a risk for potential resonance. The configuration should not be adopted.

example 3

[0051]A second prototype air moving device 100 comprised an outer casing 102 approximately 17.5 inches in axial length 144, and 18.5 inches in diameter. The blade assembly 126 measured 18.0 inches in diameter and included four blades 128. The air moving device 100 included seven de-swirl vanes 138 spaced approximately 0.5 inches from the exit plane of the blade assembly 126. Each de-swirl vane 138 was formed of thin sheet metal, having an axial length 144 of 9.0 inches, a chord length 146 of approximately 4.25 inches, and a radius (RV) of approximately 5.4 inches, such that the inner diameter of the de-swirl vane package 136 was approximately 9.75 inches.

[0052]The vane passing excitation fundamental frequency may be expressed as:

Fpass=(NV×Ω) / 60=(7×2000) / 60=233 Hz  (1)

[0053]The higher harmonics or multiples of the fundamental frequency may be expressed as:

Fharm=m×(NV×Ω) / 60=m×200 Hz=466 Hz,700 Hz,etc.  (2)

[0054]To calculate the subharmonic fundamental frequency, the common factor must...

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Abstract

An air moving device includes an outer casing comprising an outer diameter, an inner portion defining a flow path, an inlet portion defining an inlet cross-sectional area, and an opposing outlet portion defining an outlet cross-sectional area. A motor assembly is disposed within the outer casing, and a hub and blade assembly is secured to a shaft on the motor assembly. The air moving device further includes a de-swirl vane package. The package includes a plurality of de-swirl vanes disposed in the flow path. The blades are characterized by one or more resonant frequencies, and a potential excitation source of the blade resonant frequencies is a flow path obstruction comprising a plurality of objects substantially equally spaced about the circumference of the flow path. The flow path obstruction is characterized by a periodic frequency. The periodic frequency differs from the blade resonant frequencies by a safety margin of at least 20%.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]Reference is made to and this application claims priority from and the benefit of U.S. Provisional Application Ser. No. 62 / 350,199, filed Jun. 15, 2016, entitled “COMPACT AIR MOVING DEVICE”, which application is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]This disclosure relates generally to an air moving device and, more specifically, to an air moving device having laminar, high velocity flow over long distances.[0003]Large industrial spaces such as warehouses or factory floors may have a clear height of 32 feet or more (the dimension from the floor to the bottom of an obstruction hanging from the ceiling; examples include joists, light fixtures, heaters, or sprinkler heads). Heating or cooling this vast area is difficult, and results in thermal gradients from the floor to the ceiling as warm air rises and cooler air is pushed downward. Often, an industrial HVAC system may suffer from dead spots havin...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F04D29/54F04D25/08F04D19/00F04D29/32F04D29/52
CPCF04D29/542F04D19/002F04D25/088F04D29/325F04D29/522
Inventor BEREAN, KYLE
Owner DLMFG